Shock absorber



W. T. FOX.

SHOCK ABSORBER Sept-23', 1930.

Filed Ma 5, 1928 5 Inventor Wfl/fam *f3/Y A flo-mcy Patented sept.23,193o Y Y' 1,776,766Y

'7 UNITED STATES PATENT OFFICE WILLIAM T. FOX, or RocHEsrEn, NEW YORK; GERTRUDE M. LAvIN AND FRANK o.

sMI'rII EXEcUToRs or sAIn WILLIAM fr. Fox, DEcIIAsED v sIfIocK ABsoRBEn Application filed May 5, 1928. Serial 110.275,295. Y

The object of this invention is to provide the pulley 11. By pulling on the rope 13 the anew and improved shock absorber for flying screw is turned up to disengage the plunger machines to be used more especially to cushion and by pulling on the rope 14 the screw is the blow With Which the flying machine turned dovvn to engage the plunger.

5 strikes the ground When it takes a nose dive. `Vlfhen the flying machine takes the position 50 This and other objects of the invention Will shovvn in Figure 1, the pilot can pull on the be illustrated in the drawings, described in rope 13 and release theY plunger 7 Which can the specification and pointed out in the claims then move outby gravity. The more the ilyat the end thereof. ing machine comes to a vertical position or in lo `In the drawings; Y 1 other \vords,the nearer it comes to making a Figure 1 is a side elevation of the flying nose dive, the faster the plungervvill move machine in a descending position. out. It necessary the outward movement of Figure 2 is a longitudinal section through the plunge-r maybe assisted by blowing com-` the shock absorber. `pressed air into the cylinder back of the' Figure 3 is a side elevation of the flying ma.- plunger. l

r chine With the shock absorbers applied to the In the absence of compressed air, however,

sides of the machine. a valve 15 is `provided which is normally held Figure 1l is 'a section on the line 4X 4X `of on its seat by a spring 16.` This valve opens Figure 3 n y Yas the plunger runs out in the cylinder and Figure 5 is av section on the line 5", 5x of Figthe plunger then draws air in past the valve Gv o ure 8. so that the cylinder is iilled with air as the In the drawings like reference numerals in plunger moves out.

dicate like parts. A Vhen the machine reaches the ground, the

In the drawings reference numeral 1 indiplungerV 7 strikes the ground first `and is cates the flying machine having a propeller 2 driven into the cylinder or the cylinder moves 70 thereon driven by a gear 3 Which in turn is down on it compressing the air that isinside driven by a pinion L'Which Vis-driven by an of the cylinder. For this purposea packing engine shaft and engine Vin the usual Way. 17 is provided on the plunger Which makes an The propeller and gear are lcarried on the air tight fit With the cylinder so as to com gear revolving around `or on the sleeve as aV pression of the air sloWs down the flying mabearing. This sleeve is supported bythecylchine so thatA it reduces the shock or impact inder 6V Whichv is carried on the fra-nie of the With Which it strikes the ground. The cylin-v flying machine and suitably anchored to it. der 6 is-provded with a vent18 which lets sleeve 5 Which is stationary, the propeller and press the y air in the cylinder, andthe coin- 75,y

35 In the cylinder 6 and sleeve `5 is provided a out some'of the air as the pressure rises in the my plunger 7. `On the rear of this plunger is cylinder so as to further reduce the .force of 4provided a collar9 Which is engaged by a the impact With Which theV machine strikes. screw 10 by which the plunger is held nor- This vent is placed a'suitable distance from' Inally in the position shown in'Figure 2. OD the rear end of thecylinder sothat When the Oftliisscrew is provided the pulleys 11 and12 packing on the plunger passes the vent no.. 35,

by Which thescreW 10 is turned in to engage more air can escape and thereafter all the sin the collar 9 or is turned out to disengage the Will becompressed toreduce' the sho-ck of the collar and release the plunger. The rope 13 machine. '1 i 'Y y is Wound Vone Way around the pulley 11 and InFigures 3- and l` I' have shown awpair '.{the rope 14 is Woundthefother vvayaround of shock absorbers 21 and@ 4inoiuited on a 9g shaft 23 which shaft is mounted in the body of the machine l. The shock absorbers are mounted to swing` en this shaft. The free end of each of the/shock absorbers is supported in the cradles 24, 25, the lower side of each of Which cradles is pivoted to the upper side so that the cradles can open to drop the free end of the shock absorber. Each of the lower sides of the cradles is perforated with a slot 26 to permit a tongue 27 to pass therethrough which tongue is carried on the upper stationary half off the cradle. The lower half of the cradle is held in place by a pin; 28 which passes through` ahole in,

the tongue '27'. lVhen the pilot Wishes to. use the shock absorber he pulls out the pins 27 which permits the cradles to open and allow the free ends of the shock absorbers to swing down after which the plungerswill move out to the extended position so that the shock absorbers can function inthe manner above described, To permit thel pins 27 to be drawn. out from the cradles` cables 29 areprovided therefor which., are AWithin reach ot e the pilot. y

To prevent the plunger fromy being drive-u into thel ground when it strikes the'groungl `the plunger is provided` With the collar-"301 which has abroad bearing surface which prevents it from sinking into the groundf more than a very short distance.v c

. Inforder. to increase the pressure in the cylinders ofthe shock abserbers,a small high pressure air-tank may be carried by; the air'- plane and this tank connected to ,thevr cylinders of the shockabsorbersat the head1 thereof: with a suitable check valve and controlling valve inthe conuectingpipe. line so thatthe y air pressuretronx the high pressure tank into s theV cylinders of the shook absorbers can be controlled.

l claim: f l'. A shock absorber comprising a cylinder fastened inthe body ota flying machine, a

plunger mounted to. slide in said: cylinder,

a sleeve surrounding said plunger,a propel` ler mounted; to rotate onsaid sleeve and means to; rotate the propeller areundvsaid sleeve. Y

2. A shock absorber compr'` fastened in the bodyV ot 'Flyin-g'Y plunger mounted tosli'de. in saifr sleeve surrounding said plunger, va. propeller mounted:.toA rotate on sa Wheel fastened to the hub( an engine' shari-it pai-allelito said.l sleev pinionL ou said; s

'aid propo iler, n a

onthe propeller.

3; A shook absorber Comprising a lc vlfinder fastenedl in the body' oi atlying machine, a

plunger mounted-1slideVinsaid cylinder,.- a sleeve surrounding-said` plunger, a propel-V ler mounted to rotateon said sleevey and:`

means to rotate the propeller around said l cvlindena L., hai't' meshing; with. the gear er, a screw engaging said collar, a pulley to rotate said screw to release said collar and plunger.

1l. A shock absorber comprising a cylinder 'fastened in the body of a flying machine, a

screw' to release said collar and plunger, a

rope Wound on said pulley adapted to rotate it on the pulling of the rope.

In testimony whereof I ailix my signature.

WILLIAM T. FOX. 

